Draftsman&#39;s table



Jan. 9, 1934. A, QFAR'RELL 1,942,727

DRAFTSMAN S TABLE Filed June 12. 1933 3 Sheets-Sheet l o s fi INVENTOR Jan. 9, 1934. G. A. OFARRELL DRAFTSMANS TABLE Filed June 12, 1933 3 Sheets-Sheet 2 Fly-3.

INVENTOR' Jan. 9, 1934. OFARRELL 1,942,727

DRAFTSMAN 5 TABLE Filed June 12, 1933 3 Sheets-Sheet 3 INVENTOR Patented Jan. 9, 1934 UNITED STATES PATENT F'FICE 10 Claims.

The invention relates to a draftsmans table and more particularly to the means for securing the drawing paper or fabric which is used upon the table, the present application constituting a continuation in part of my application, Serial No. 637,262, filed October 11, 1932. The invention has for its principal objects, the provision of improved means for holding the drawing paper or fabric securely and adjustably on the board without the use of thumb tacks, and for maintaining such paper tight and smooth at all times regardless of changes in atmospheric temperature and humidity. Certain embodiments of the invention are shown in the accompany drawings, wherein:

Figure 1 is a side elevation of the table in its preferred form. Fig. 2 is a partial front elevation. Fig. 3 is a partial plan view. Fig. 4 is a partial rear elevation. Figs. 5 and 6 are detail views on an enlarged scale. Figs. '7 and 8 are further detail views on an enlarged scale, Fig. 8

being a section on the line VIII-VIII of Fig. 7.

Fig. 9 is a partial side elevation showing a modification. Figs. 10 to 13 are detail views showing a further modification, Figs. 10 and 11 being longitudinal and transverse sections respectively, and Figs. 12 and 13 being front and side elevation views respectively. And Fig. 14 is a detail plan view.

Referring to the drawings, 1 is one of two similar end members of the table frame shaped as indicated in Fig. 1 and consisting of metal strips, such end members being secured together by means of the angle irons 2, 2 and the foot board 3, and supported upon the angle brackets 4, 4.

The structure is preferably bolted together throughout to permit it to be knocked down and shipped in compact form.

The board 5, which is of wood, is provided at one side with brackets 6 pivoted at 7 to brackets 8 carried by the frame. At its opposite side, it is provided with brackets 9 carrying the pivoted links 10 which support the board at various positions of adjustment, pins 11 carried by brackets 12 and engaging the holes 13, serving to provide the necessary adjustment.

The drawing paper 14, or other fabric, is clamped at its upper edge between plates 15 and 16, bolts 1'7 having thumb nuts 18 being employed for the purpose, as shown in detail in Figs. '7 and 8. Along the sides of the board are the metal plates 19, 19 provided with the key hole slots 20 (Fig. 14), the board beneath such slots being cut out as indicated at 21 (Fig. 8). The heads of the bolts 17 engage the plates 15, and when the nuts 18 are tightened, the plates 15 and 16 are held against movement with respect to the board. Means are thus provided wherebythe upper edge of the paper may be adjusted to suit the convenience of the draftsman. With wide tables and large drawings, this permits the draftsman to adjust the position of the upper edge of the paper so that it is not necessaryfor him to be across the board.

The lower edge of the paper is clamped between the plates 22 and 23 (Figs. 5 and 6) by means of a pair of bolts 24 having the hand wheels or discs 25 at their outer ends for con- Venience in turning. The plate 22 is integral with a pair of brackets'26 which are pivoted on a rod 27, and such rod is in turn carried by a pair of arms 28. These arms are pivoted at their other ends upon a rod 29 extending transversely of the table and mounted in brackets 30 secured tothe bottom side of the board 5. The weight of the plates 22 and 23 and the'arms, which'may be additionally weighted to suit requirements, serves to hold the paper tightly on the board at various positions of adjustment, the dotted position a showing the parts when a substantial portion of the sheet 14 has been adjusted to a'position below the table. This device insures that the paper or fabric will not become wrinkled on the board under varying temperature or humidity conditions, as gravity applies a yielding force tending to pull the paper fiat on the board at all times. The lower edge of the board is rounded, as indicated at 31 (Fig. 6), so that the paper is eased around such edge without making any sharp bend tending to crack or permanently distort it. A guard in the form of a roller 32, carried by brackets 33, shields the gripping device 22,

23 and the paper at the edge of the board from contact with the body of the draftsman.

Fig. 9 illustrates a modification, in which the gripping plates 34 and 35 for the lower edge of the paper is pulled downward by cables 36, to which are attached the weights 37. These cables pass around the pulleys 38 and 39 carried by the brackets 40 and 41. The brackets 40 also carry a shield 42 which performs the function of the roller 32 of the Fig. 1 construction.

Figs. 10 to 13 illustrate a further modification in which the lower edge of the paper is engaged by a roller 43 which is tensioned by a spring 44, thus yieldingly pulling the paper tight over the board, and performing the function of the weight devices of the forms of construction heretofore described. The paper is secured to the periphery of the roller by the clamping plate 45 and screws 46, and the roller is pivotally supported in brackets 47 carried by the board 5. One end of the spring 44 is secured to one of the end pieces 48 of the roller while the other end is secured to the bracket, and the spring is tensioned, so as to tend to turn the roller in a counter clockwise direction (Fig. 11) and so tension the paper. The end piece 48 is provided with a ratchet at) which is engaged by a pawl 59 carried on the pivot 51 extendingthrough the bracket and carrying the operating handle 52. As is the case with the weight devices of the other "forms of construction, this device keeps the paper tensioned and smooth regardless of temperature and humidity changes.

What I claim is:

1. In combination with a drawing board, means for clamping the drawing paper at one edge in fixed relation to the board, and means for gripping the opposite edge of the paper and applying constant yielding force thereto in the plane of the paper to compensate for the contraction and expansion of the paper due to varying conditions of moisture content in the paper.

2. In combination with a drawing board, clamping means for engaging one edge of the drawing paper mounted for adjustment toward and from the edge of the board, means for gripping the opposite edge of the sheet, and means for applying yielding force to said last means tending to move it away from the clamping means.

3. In combination with a drawing. board, clamping means for engaging one edge of the drawing paper mounted for adjustment toward and from the edge of the board, means for gripping the opposite edge of the sheet, and weighted means connected to the means gripping the edge of the sheet for drawing such gripping means around the edge of the table and beneath the table.

4. In combination with a drawing board, clamping means for engaging one edge of the drawing paper mounted for adjustment toward and from the edge of the board, guide means at the opposite edge of the board for guiding the opposite edge of the sheet around the edge of the table to a point therebeneath, and gripping means engaging said edge and pulling the paper tight over the table. 1

5. In combination with a drawing board, clamping means for engaging one edge of the drawing paper mounted for adjustment toward and from the edge of the board, means for guiding the opposite edge of the sheet around the edge of the table, gripping means engaging said edge, and weighted means connected to said gripping means, for applying constant yielding tension to the sheet.

6. In combination with a drawing board, clamping means for engaging one edge of the drawing paper mounted for adjustment toward and from the edge of the board, means for guiding the opposite edge of the sheet around the edge of the table, gripping means engaging said edge, and an arm connected to said gripping means at one end and pivoted at its other end beneath the table.

7. In combination with a drawing board, clamping means for engaging on edge of the drawing paper mounted for adjustment toward and from the edge of the board, means for guiding the'opposite edge of the sheet around the edge of the table, gripping means engaging said edge, and an arm pivoted to said gripping means at one end and pivoted at its other end beneath the table.

8. In combination with a drawing board, clamping means for engaging one edge of the drawing paper mounted for adjustment toward and from the edge of the board, means for guiding the opposite edge of the sheet around the edge of the table, gripping means engaging said edge, an arm connected to said gripping means at one end and pivoted at its other end beneath the table, and a guard for the paper extending along the lower edge of the table in opposition to said edge.

9. In combination with a drawing board, clamping means for engaging one edge of the drawin paper mounted for adjustment toward and irem the edge of the board, means for guiding the opposite edge of the sheet around the edge of the table, gripping means engaging said edge,.an arm connected to said gripping means at one end and pivoted at its other end beneath the table, and a guardroller for the paper extending along the lower edge of the table in opposition to said edge. 7

10. In combination with a drawing board, means for securing the drawing paper at one edge in fixed relation to the board, a roller at one end of the board below the edge thereof, means for securing the edge of the paper to the ro ler, and a spring tending to rotate the roller so as to wind the paper thereon, whereby the paper is maintained under tension on the board.

G. A. OFARRELL. 

